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(No Model.) v 3 ShetsSheet 2 S. V. RAWLINGS. SAW 'SWAGrE.

No. 593,782. Patented Nov. 16, 1897,

(No Model.) I 3 SheetsSheet 3 S. V. RAWLINGS.

SAW SWAGE. No. 593,782. Patented Nov. 16,1897

' thereby rendered unfit for use.

NITED STATES PATENT Fries.

SAMUEL v. RAWLINGS, or MARQUETTE, MICHIGAN, Assicnon'or ONE- HALF TO SEYMOUR H. HOLLEY, or SAME PLACE.

SAW-SWAG E.

I SPECIFICATION forming part of Letters Patent No. 593,782, dated November 16, 1897.

Application filed June 26,1896. Serial No. 596,989. (No model.)

To all whom it may concern:

Be it known that I, SAMUEL V. RAWLINGS, a citizen of the United States, and a resident of the city and county of Marquette, in the State of Michigan, have invented certain new and useful Improvements in Saw-Swages, of which I do declare the following to be a full, clear, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

The present invention has for its object more particularly to provide an improved construction of saw-swage especially adapted for the swaging of that type of saws having round interdental throats and chisel-pointed teeth. In swaging saw-teeth it is of the utmost importance that the original shape of Y has been found in practice that the shape of the tooth is speedily destroyed and the saw In swaging such type of saw-tooth resort has heretofore been had to swages in which a depression of the metal at the top or crown of the tooth 'is made, and during such depression .of the metal at the top or crown the under side of the tooth-point has been supported by a die, serving to rigidly retain or preserve the original shape of the throat between the teeth. It has been found, however, that in the use of such prior type of swage the depression of the crown of the tooth spreads the metal so abruptly atthe top of the tooth-crown that its efiiect upon the lumber is to mar the same, so that this method of swaging has also me with disfavor.

By mypresent invention I provide a swage whereby the original shape ofthe tooth may be preserved and whereby the .abrupt lateral expansion of the metal may be avoided, and instead of such abrupt lateral expansion a gradual lateral expansion of the metal may be had, so that the desired chisel-shaped outline in cross-section shall. be given to the tooth.

The leading feature of my present invention consists in first depressing or swaging downward the crown of the tooth, and thereafter swaging upward from the bottom or under side of the tooth the material that had been pressed down from the top, so that the original diameter of the interdental throat is 4 is a view in side elevation from the opposite side of the swage shown in Fig. 1. Fig. 5 is a view in vertical cross-section on line 5 5 of Fig. 3. Fig. 6 is a detail end View of the tailpiece, its support being shown in vertical section. Fig. 7 is a detail end view of the headpiece. Fig. 8 is a detail view, in front elevation,of the lever that operates the anvil-block. Fig. 9 is a detail view, in front elevation, of the anvil-block. Fig. 10 is a detail View of the die-carrying roller. Fig. 11 is an end View of a die-carrying roller. Fig. 12 is a view in cross-section on line 12 12 of Fig. 10. Fig. 13 is a view showing the right-hand end of the die-carrying roller.

The body of the swage is shown as consisting of side'portions A and A, that are united together by cross-webs a, a, and a (see Figs. 2 and 5,) it being understood, of course, that these parts will be formed preferably of a single casting. Between the depending parts of the side portions A and A is formed the open space (1 in which the saw-blade X will be held during the swaging operation. In the 5 side portion A of the swage-body is formed a threaded perforation to receive the screw B, and at the opposite point of the portion A is formed a like threaded perforation to receive the screw-threaded shaft B, the outer end of which has fixed thereto the handle B The screw 13 and the screw-shaft B serve to firmly hold the saw-blade in position during the swaging operation by firmly clamping the opposite sides of the blade, as shown in Fig. 5, and by preference a set-screw b, that passes through a correspondingly-threaded hole in the side portion A of the swage-body, serves to hold the screw B with accuracy in any position at which said screw B may be set. Through the depending portions A and A of the swagebody is formed a transverse circular opening to receive the die-carrying roller 0, the preferred form of which is more fully illustrated in Figs. 10 to 13 of the drawings. One end of this roller C is of polygonal outline, as shown in c, and has fixed thereto the operating-handle O, and through the opposite end of the roller 0 is formed a circular hole or seat to receive the roller-die C and its retainingpin 3. The roller-die C is shown of a length equal to the space between the sides A and A of the swage, although, if desired, it can be the full length of the hole formed in the roller 0, in which event the retaining-pin 3 need not be used. The die-carrying roller 0 is shown as formed with the annular groove 0 adjacent one end, into which will set the yoke-shaped end of a retaining-plate 2, that is held in position by means of a set-screw 3, (see Fig. 4,) and in order to retain the rollerdie 0 in place within the roller C a plate 4 is attached to the side of the swage-body by means of a set-screw 5. (See Fig. 5.)

The die-carrying roller 0, as seen in Figs. 2, 5, and 10, is shown as cut away, as at 0 about its center, leaving the raised or eecentric portions 0 at each side of the central cutaway space c and, as seen in Fig. 12, these raised portions 0 which are shown as of the same radius as the body of the roller 0, extend about one-third of the periphery of the rollerthat is to say, from the point 6 to the point 7. The periphery of the roller 0, as will be seen by Figs. 10 and 12, is cut away in the plane of the raised portion 0 from the points 6 and '7 downward, leaving the raised portion a and leaving the flattened or cutaway spaces 0 and 0. Into the cut-away spaces a extend the bifurcated end portions (1 of the lever D, (see Fig. 2,) that is journaled upon a pin 8, that passes through the body of the swage. The lever D is an elbow-lever, and in its upper end is formed a threaded hole to receive an adj usting-screw D, that is fitted preferably with a jam-nut D The purpose of the screw D is to determine with accuracy the extent of movement of the anvil E, that is mounted within a suitable seat or channel formed in the body of the swage, as shown in Fig. 2. The adj usting-serew D also serves to take up any lost motion incident to imperfect fit of the parts or incident to wear from usage. This anvil E (see Fig. 2) has its lower end preferably formed with two tips e, either of which may be used to give the proper swaging action upon the sawtooth, it being understood, of course, that when one of the tips 6 has become worn the anvil E can be reversed, so as to bring the opposite tip into position for use. a

From the construction of parts as thus far defined the operation will be seen to be as follows: The saw-blade X will be placed be tween the screw B and the screw-shaft B in the position seen in Figs. 2 and 5 of the drawings, at which time the under side of the first tooth-point to be swaged will extend beneath the anvil-tip e and rest upon the curved portion of the roller 0 at the base of the cutaway space c (See Figs. 2 and 10.) The handle B will then be turned so as to cause the screw-shaft B to firmly clamp the sawblade in position, and the handle C will next be turned, so as to cause the die-carrying roller 0 to revolve in the direction of the arrow, Fig. 2. As the roller 0 thus revolves the raised portions 0 will bear upon the ends d of the elbow-lever D, thereby causing this lever to rock about its pivot-point and to force downward the anvil E, causing the tip a of the anvil to compress the metal at the top of the saw-tooth. As this compression of the metal begins the flat cut-away space a, that extends above the roller-die 0 will come beneath the point of the saw-tooth, so that as the downward movement of the anvil E continues the point of the saw-tooth will be forced downward into this cut-away or flat space 0". As the roller C continues to revolve in the direction of the arrow, Fig. 2, the roller-die C will contact with the under surface of the saw-tooth that has just been depressed and force the same upward, but as the upward movement of the depressed portion of the saw-tooth is resisted by the tip of the anvil E it is obvious that the metal constituting the saw-tooth point will be spread or swaged laterally. It will be observed that the periphery of the roller-die C is concentric with the portion of the roller 0 at the base of the cutaway space G Consequently when the rollerdie C has thus been forced beneath the point of the saw-tooth the interdental throat of the saw-tooth will be restored to its original diameter and shape. This is a feature of the utmost importance, since swages that have been heretofore employed upon saw-teeth of the type shown-that is to say, of the roundpoint and chisel-pointed typeand in which a swaging of the saw-tooth is effected from the under side, the shape of the tooth has been soon destroyed.

By means of the set-screwD it will be seen that the position of the anvilE can be readily determined, so as to give any degree of swaging action upon the teeth of the saw.

In order to properly hold the swage in position upon the saw-blade and prevent its tilting back or forth during the swaging operation and in order also to enable the body of the swage to be so adjusted as to vary the angle at which the tip 6 of the anvil E shall act upon the saw-teeth, Lprovide the adjustable head-block F and tail-block G, these blocks being carried, respectively, by suitable supports F and G. The head-block F is adjustably mounted upon its supportingarm F and held in any desired positionby a set-screw f and j am-nut f and the support F (see Fig. 7) has its expanded space formed with the slots f through which pass the setescrews f whereby the support F can be set at any desired position with respect to the body of the swage. The tail-block or shoe G has its upper portion bifurcated to straddle its support G, to which it is connected by a throughbolt 9 and nuts g. The bifurcated ends of the tail-block G are provided with the slots g and the support G is provided with the slot 9 through which slots the bolt gpasses, and by means of the slots g andg and the bolt g the position of thetail-block G upon its support G can be shifted, as desired. By reference to Fig. 6 it will be seen that the base of the tail-block support G is formed with slots 9 through which pass the setscrews 9 that enter threaded perforations in the body of the swage and serve to permit the adjustment of the support G in upward or downward direction. It will be observed that the lower end of the tail-block G is bifurcated (see Fig. 6) to straddle the saw-blade, and the tail-block is furnished with a shoe 9, of chilled steel, to better resist wear. By adj usting the head-block F its tip f 4 can be brought to bear upon that part of the crown of the saw-teeth not acted upon by the anvil E, whatever may be the distance between the teeth of the saw.

To one side of the body of the swage is attached a stop-arm T, that is held in place by a set-screw 25, this arm being formed with an angular end 25', (see Fig. 3,) against which the handle 0' will contact and by which its movement will be limited, so that at the beginning of the swaging operation and when the handle Ois resting against the stop-arm T the parts will be in proper relation to receive the teeth of the saw.

My present invention presents the first instance, so far as I am aware, of a saw-swage that is adapted to swage from the bottom or under side of the tooth the material that is pressed down from the top or crown of the tooth, thus avoiding any change in the original outline of the throat of the tooth.

It is manifest that in carrying out the invention the precise details of structure above set forth may be modified within wide limits without departing from the spirit of the invention, and I do not therefore wish the invention to be understood as restricted to such details.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. A saw-swage comprising the combination of a suitable anvil,means for shifting said anvil to cause it to compress the top of the sawtooth, a movable die having a reduced or flattened part exposed to the under side of the saw-tooth during the compressive action of the anvil and havinga projecting part to engage the under side of the saw-tooth after the top of said tooth has been compressed by the movement of the anvil and swage outward the material pressed down from the top or crown of the tooth, substantially as described.

2. In a saw-swage the combination of a suitable anvil, means for shifting said anvil to cause it to compress the top of the saw-tooth, a rotary die having a reduced or flattened part exposed to the under side of the saw-tooth during the movement of said anvil and hav-v in g a projecting part to engage the under side of the saw-tooth after the top of said tooth has been compressed by the anvil and swage outward the material pressed down from the top or crown of the tooth, substantially as described. I

3. In a saw-swage the combination of asuitable anvil, means for shifting said anvil to cause it to compress the top of the saw-tooth,

a rotary die having a reduced or flattened part exposed to the under side of the saw-tooth during the movement of the anvil and having a projecting part consisting of a rollerdie to engage the under side of the saw-tooth after the top of said tooth has been compressed by the anvil and swage outward the material pressed down from the top, substantially as described.

4:. The combination of a suitable anvil, a die-carrying roller provided with a roller-die mounted therein, said die-carrying roller being reduced or flattened at one side of the roller-die to permit the metal of the saw-tooth to be depressed by the anvil, and means for shifting said anvil to cause it to compress the top of the saw-tooth before said roller-die is brought into engagement with the under side of said saw-tooth, substantially as described.

5. In a saw-swage the combination of a suitable anvil, a die-carryin g roller having a bearing-surface against which the under side of the saw-tooth will bear when said tooth is first inserted in the swage and having a roller-die projecting from its periphery and having a reduced or flattened portion intermediate said roller-die and said bearing-surface and suitable means for shifting said anvil tocause it to compress the saw-tooth while the end of said tooth is opposite the reduced or flattened portion of the die-carrying roller and before the roller-die is caused to, engage theunder side of the saw-tooth, substantially as described.

6. In a saw-swage the combination with a suitable anvil, of a rotary die-carrying roller having a raised or eccentric part and having a suitable part to act upon the under sideof the saw-tooth, and a pivoted lever, one arm of which engages the raised or eccentric part of the die-carrying roller and the other arm of which actuates said anvil, substantially as described.

7.. In a saw-swage the combination with a die 0 and having the cut-away space 0 and the raised parts 0 the pivoted elbow-lever D, the lower end whereof engages said roller 0, the set-screw D extending through the upper end of said elbow-lever and the anvil E bearing against said set-screw D, substantially as described.

SAMUEL V. RAlVLINGS.

WVitnesses:

J. FRED KERN, N. G. DE I'IAAS. 

